This image by pyxelated on deviantart has been floating around for a little bit, but I think it captures one possible future scenario perfectly.

People walking around with headphones and MP3 players/cellphones already aurally isolate themselves from their surroundings, but if personal viewing glasses like the Myvu take off and get really immersive, will we find visual-tainment junkies in rooms like this? [Deviantart]